A male human being who does or has done something that makes them feel superior to others, or very good about themselves, even though they know that their accomplishment doesn't truly mean anything.

Just a few examples of being a Big Man include:
-Driving much faster than the person in the lane next to you
-Eating more than anyone else at a party
-Having a vanity license plate with a "cool" word
-Beating someone by a lot in a game
-Wearing sunglasses all the time
-Drinking more alcohol than someone else
-Having a "cool" nickname
-Cracking your knuckles for emphasis

A character from Robert Kelly's hip-hop opera "Trapped in the Closet". Big Man also happens to be an asthmatic midget stripper. The severity of this character's random traits lead some to believe that the outrageous occurences of R. Kelly's hip-hop opera are just a ploy to make the public forget his "golden shower" upon a girl not yet of age.

Officer: "Hey, why they call you Big Man?"
Big Man: "Well I guess it is because I am blessed."